package ch.njol.skript.expressions;

import ch.njol.skript.Skript;
import ch.njol.skript.doc.Description;
import ch.njol.skript.doc.Examples;
import ch.njol.skript.doc.Name;
import ch.njol.skript.doc.Since;
import ch.njol.skript.lang.Expression;
import ch.njol.skript.lang.ExpressionType;
import ch.njol.skript.lang.SkriptParser;
import ch.njol.skript.lang.util.SimpleExpression;
import ch.njol.util.Kleenean;
import ch.njol.util.coll.CollectionUtils;
import org.bukkit.Bukkit;
import org.bukkit.Server;
import org.bukkit.event.Event;
import org.jetbrains.annotations.Nullable;

@Name("TPS (ticks per second)")
@Description("Returns the 3 most recent TPS readings, like the /tps command. " +
			"This expression is only supported on some server software (PaperSpigot).")
@Examples("broadcast \"%tps%\"")
@Since("2.2-dev36")
public class ExprTPS extends SimpleExpression<Number> {

	private static final boolean SUPPORTED = Skript.methodExists(Server.class, "getTPS");
	private int index;
	private String expr = "tps";

	static {
		Skript.registerExpression(ExprTPS.class, Number.class, ExpressionType.SIMPLE,
				"tps from [the] last ([1] minute|1[ ]m[inute])",
				"tps from [the] last 5[ ]m[inutes]",
				"tps from [the] last 15[ ]m[inutes]",
				"[the] tps");
	}

	@Override
	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
		if (!SUPPORTED) {
			Skript.error("The TPS expression is not supported on this server software");
			return false;
		}
		expr = parseResult.expr;
		index = matchedPattern;
		return true;
	}

	@Override
	protected Number[] get(Event e) {
		double[] tps = Bukkit.getServer().getTPS();
		if (index != 3) {
			return new Number[] { tps[index] };
		}
		return CollectionUtils.wrap(tps);
	}

	@Override
	public Class<? extends Number> getReturnType() {
		return Number.class;
	}

	@Override
	public boolean isSingle() {
		return index != 3;
	}

	@Override
	public String toString(@Nullable Event e, boolean debug) {
		return expr;
	}

}
